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DESCRIPTION OF BUSINESS (Details) - Viventia Bio Inc.
shares in Millions, $ in Millions
1 Months Ended
Sep. 30, 2016
USD ($)
shares
Variable Interest Entity [Line Items]  
Shares of common stock issued to the selling shareholders (in shares) | shares 4.0
Percentage of voting interests acquired 19.90%
Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone  
Variable Interest Entity [Line Items]  
Percentage of net sales of quarterly earn-out payments during earn-out periods 2.00%
Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone | United States  
Variable Interest Entity [Line Items]  
One-time milestone payment upon first sale of product $ 12.5
Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone | Europe  
Variable Interest Entity [Line Items]  
One-time milestone payment upon first sale of product 7.0
Vicinium | Collaborative Arrangement, Revenue based on Specified Milestone | Japan  
Variable Interest Entity [Line Items]  
One-time milestone payment upon first sale of product $ 3.0